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JEE Main 2025 Jan 24 Shift 1, Chemistry Q10: Periodicity In Atomic Properties

JEE Main2025Jan 24, Shift 1Chemistry
Q.

Which of the following Statements are NOT true about the periodic table?

A. The properties of elements are function of atomic weights.

B. The properties of elements are function of atomic numbers.

C. Elements having similar outer electronic configuration are arranged in same period.

D. An element's location reflects the quantum numbers of the last filled orbital.

E. The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled.

Choose the correct answer from the options given below:

  1. A

    A, C and E Only

  2. B

    D and E Only

  3. C

    A and E Only

  4. D

    B, C and E Only

Solution

Evaluate each statement against the modern periodic law:

A. Properties are periodic functions of atomic number, not atomic weight (this was Mendeleev's earlier view, since superseded). NOT true.

B. Periodic dependence on atomic number true.

C. Elements with similar outer electronic configurations are arranged in the same group, not the same period. NOT true.

D. Position in the table is fixed by the quantum numbers of the differentiating electron true.

E. The number of elements in a period equals twice the number of orbitals being filled (each orbital holds 2 electrons), not the number of orbitals itself. NOT true.

The NOT-true statements are A, C and E. Option (1).

Concept behind this question

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